<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Encrypt.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Filter_Encrypt
 */
require_once 'Zend/Filter/Encrypt.php';

/**
 * Encrypts a given file and stores the encrypted file content
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Filter_File_Encrypt extends Zend_Filter_Encrypt {
	/**
	 * New filename to set
	 *
	 * @var string
	 */
	protected $_filename;
	
	/**
	 * Returns the new filename where the content will be stored
	 *
	 * @return string
	 */
	public function getFilename() {
		return $this->_filename;
	}
	
	/**
	 * Sets the new filename where the content will be stored
	 *
	 * @param  string $filename (Optional) New filename to set
	 * @return Zend_Filter_File_Encryt
	 */
	public function setFilename($filename = null) {
		$this->_filename = $filename;
		return $this;
	}
	
	/**
	 * Defined by Zend_Filter_Interface
	 *
	 * Encrypts the file $value with the defined settings
	 *
	 * @param  string $value Full path of file to change
	 * @return string The filename which has been set, or false when there were errors
	 */
	public function filter($value) {
		if (! file_exists ( $value )) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "File '$value' not found" );
		}
		
		if (! isset ( $this->_filename )) {
			$this->_filename = $value;
		}
		
		if (file_exists ( $this->_filename ) and ! is_writable ( $this->_filename )) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "File '{$this->_filename}' is not writable" );
		}
		
		$content = file_get_contents ( $value );
		if (! $content) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "Problem while reading file '$value'" );
		}
		
		$encrypted = parent::filter ( $content );
		$result = file_put_contents ( $this->_filename, $encrypted );
		
		if (! $result) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "Problem while writing file '{$this->_filename}'" );
		}
		
		return $this->_filename;
	}
}
